Sample 254 doesn't set OUT_ONLY when sending response using VFS

When executing sample 254 repeatedly, one gets the following message in the logs:

2009-05-10 14:03:03,777 [-] [HttpClientWorker-3] DEBUG SynapseCallbackReceiver Callback added. Total callbacks waiting for : 3

This means that the sample leaves entries in the callback table. The reason is that the sample doesn't set OUT_ONLY when sending the response using the VFS transport. Synapse therefore assumes that a response will be received from the transport, but the VFS transport doesn't support request-response.